Ok, so to sum up this thread. -Power Commander. If you have the money, get one. You can use it to smooth your bikes power curve and to properly tune for the correct air/fuel ratio. On most bikes, there's no monitoring equipment to tell the ECU exactly how much air the engine is getting. So if you go and put a new exhaust and intake/filter on it, you've now got more air going in/out than normal. This will lead to a lean condition. The PC is there to correct for this lean condition and to remove any drop in your power curve due to emissions regulations. It's a nice piece, it's smoothes stuff out, and there's really no downsides to it. -Spark plugs. Your bike isn't a race bike. There's no need for anything other than what the factory recommends. However, if the factory does recommend a platinum plug and you want to save a few bucks, you can usually run a standard tip plug. I run NGK V-power. Standard plugs, and they work. At $2 a pop can't beat it. -Fuel. Your bike was tuned from the factory to run on premium unleaded. These bikes are usually high compression motors, like 12.5:1. That means a high risk for detonation (or pre-ignition as it's sometimes called) if you use a lower grade fuel. The lower the octane, the higher the risk of detonation. Your bike is equipped with knock sensors. These sense detonation in the motor and will pull timing to save you from the "big-bang". While these are nice, don't rely on them. You will get the power expected out of your engine by putting in the correct grade of fuel and there's less risk involved. Regular - $2.68/gallon x 3.9 gal = $10.45 Premium - $2.88/gallon x 3.9 gal = $11.23 Difference of $.78, so put in the good juice. -Tires. Shinkos are shit. Race-takeoffs = not for you. Buy a good high-performance skreet tire and be happy. -Finally, if you don't have gear. Ya know, helmet, gloves, jacket, boots, etc. Then forget about spending any money on anything else and buy some damn gear. It does not make you "un-cool" to wear it. You may not live long enough to enjoy those extra items if/when you go down without gear. And remember, shiny side up and have fun.